Removal of stale Fortran kernels

Removal of stale Fortran kernels

These Fortran kernels are no longer used in the code.
Based on benchmarks, we will decide whether to provide
new generated Fortran kernels (possibly for ia64,
Power and/or BlueGene architectures) before the final
Gromacs 4.6 release. I would prefer to keep the Fortran
detection code in CMake until we make that call.

Change-Id: Ia73fbfe968983289bba8896f8b84fdfb262d9105